Speaker
Alexander Kastner
(University of Kassel)
Description
The asymmetry of photoelectron angular distributions (PADs) from randomly oriented enantiomers of chiral molecules in the ionization with circularly polarized light arises in forward/backward direction with respect to the light propagation. This effect is known as Photoelectron Circular Dichroism (PECD) and has so far been investigated using synchrotron radiation [1]. By employing resonance enhanced multi-photon ionization, we observed highly structured asymmetries in the range of ± 10% on bicyclic Ketones and were able to study dependency on laser parameters [2, 3, 4, 5].
Two-color fields can be used to drive electrons into trajectories usually not accessible by using a single-color field with elliptical or linear polarization. Our goal is to study to what extent two-color field geometries can be used to control electron dynamics in chiral molecules.
In this talk, we give an overview over the experimental results using a phase-locked, two-color ionization scheme on noble gases as well as chiral specimen with different laser intensities covering the multi-photon up to the region close to the tunneling regime.
[1] Laurent Nahon, Gustavo A. Garcia and Ivan Powis, Journal of Electron Spectroscopy and Related Phenomena, 204, 322-334 (2015)
[2] Christian Lux, Matthias Wollenhaupt, Tom Bolze, Qingqing Liang, Jens Köhler, Cristian Sarpe, and Thomas Baumert, Angewandte Chemie Int. Ed. 51, 5001-5005 (2012)
[3] Christian Lux, Matthias Wollenhaupt, Cristian Sarpe, and Thomas Baumert, Chem. Phys. Chem, 16, 115-137 (2015)
[4] Alexander Kastner, Christian Lux, Tom Ring, Stefanie Züllighoven, Cristian Sarpe, Arne Senftleben, and Thomas Baumert, Chem. Phys. Chem, 17, 1119-1122 (2016)
[5] Alexander Kastner, Tom Ring, Bastian C. Krüger, G. Barratt Park, Tim Schäfer, Arne Senftleben, and Thomas Baumert, J. Chem. Phys. 147, 013926 (2017)
Authors
Alexander Kastner
(University of Kassel)
Arne Senftleben
(Universität Kassel)
Cristian Sarpe
(Universität Kassel)
Hendrike Braun
(Universität Kassel)
Philipp Hillmann
(Universität Kassel)
Roxana Savulea
(Universität Kassel)
Thomas Baumert
(Universität Kassel)
Tillmann Kalas
(Universität Kassel)
Tom Ring
(Universität Kassel)
